Plumbing Calculator
Trench Volume Calculator
Use our free trench volume calculator to determine the amount of dirt to excavate or material needed for backfill (in cubic feet and cubic yards). Ideal for laying pipe, French drains, and sewer lines.
Table of Contents
Parameters
Results
Total volume based on trench dimensions
Trench Volume Formula
Volume (cubic yards) = (L × W × D) / 27
L = Trench length in feet.
W = Trench width in feet.
D = Trench depth in feet.
27 = The number of cubic feet in a cubic yard.
Common Excavation Swell Factors
| Soil Type | Swell Factor (%) |
|---|---|
| Sand or Gravel | 10% - 15% |
| Loam (Topsoil) | 15% - 25% |
| Clay | 25% - 40% |
| Solid Rock | 50% - 65% |